import React from 'react'
import "./Game.css"

class Game extends React.Component {
  render() {
    return (
      <div className="game">
        <div className="game-board">
          <Board />
        </div>
        <div className="game-info">
          <ol></ol>
        </div>
      </div>
    );
  }
}

class Board extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      squares: Array(9).fill(""),
      isNext: true,
    }
  }
  renderSquare(i) {
    return (<Square
      value={this.state.squares[i]}
      onClick={() => this.handleSquareClick(i)} />);
  }

  handleSquareClick(i) {
    const copyied_squres = this.state.squares.slice();
    if (calculateWinner(copyied_squres) || copyied_squres[i]) {
      return;
    }
    copyied_squres[i] = this.state.isNext ? 'X' : 'O';
    this.setState({
      squares: copyied_squres,
      isNext: !this.state.isNext,
    });
  }

  render() {
    const winner = calculateWinner(this.state.squares);
    let status;
    if (winner) {
      status = 'Winner :' + winner;
    }
    else {
      status = "Next player: " + (this.state.isNext ? 'X' : 'O');
    }

    return (
      <div>
        <div className="status">{status}</div>
        <div className="board-row">
          {this.renderSquare(0)}
          {this.renderSquare(1)}
          {this.renderSquare(2)}
        </div>

        <div className="board-row">
          {this.renderSquare(3)}
          {this.renderSquare(4)}
          {this.renderSquare(5)}
        </div>
        <div className="board-row">
          {this.renderSquare(6)}
          {this.renderSquare(7)}
          {this.renderSquare(8)}
        </div>
      </div>
    );
  }
}

class Square extends React.Component {
  render() {
    return (
      <button
        className="square"
        onClick={() => this.props.onClick()}>
        {this.props.value}
      </button>
    );
  }
}

function calculateWinner(squares) {
  const lines = [
    [0, 1, 2],
    [3, 4, 5],
    [6, 7, 8],
    [0, 3, 6],
    [1, 4, 7],
    [2, 5, 8],
    [0, 4, 8],
    [2, 4, 6],
  ];
  for (let i = 0; i < lines.length; i++) {
    const [a, b, c] = lines[i];
    if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
      return squares[a];
    }
  }
  return null;
}

export default Game;